ISSN: 0973-7510

E-ISSN: 2581-690X

Research Article | Open Access
Nuntavun Riddech1,2 , Nhi Yen Ma1, Phuc N. Ho3 and Pornrapee Sarin1
1Department of Microbiology, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.
2Salt-tolerant Rice Research Group, Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.
3Department of Biochemistry, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand.
Article Number: 7631 | © The Author(s). 2022
J Pure Appl Microbiol. 2022;16(3):1909-1921.
Received: 22 February 2022 | Accepted: 02 July 2022 | Published online: 12 August 2022
Issue online: September 2022

Rhizobacteria and endophytic bacteria are popular for its abilities in influencing plant growth and development. The strategy employed these bacteria as biofertilizer for planting is believed to bring several benefits such as low cost, eco-friendly, and feasible. One of the remarkable products for plant growth promoting provided by rhizobacteria and endophytic bacteria were the advantageous enzymes such as 1-aminocyclopropane-1-carboxylate deaminase, phosphatase, and cellulase. These biocatalysts then involve in several direct or indirect pathways of nutrient, growth factor, and/or defense factor synthesizes. From five different essential leafy vegetables in Thailand, this study aimed to investigate the plant growth promoting potentials of endophytic bacteria and rhizobacteria isolated from root tissue and rhizosphere, respectively, via IAA quantitative and enzyme activity assays. The selected bacterial strains were further identified using 16S rRNA gene sequencing and observed their interaction with plant root using scanning electron microscope method. Our study, thus far, has isolated two bacterial strains of Bacillus subtilis MSE5 and Bacillus cereus AVR1, respectively, with multifunctional traits of potential on the plant growth. Importantly, these two strains of MSE5 and AVR1 had shown the capacity to advance root colonization. Therefore, MSE5 and AVR1 are recommended for further studies in developing eco-friendly biofertilizer. In addition, some novel cellulose-degrading bacterial strains with significant potential on hydrolysis capacity were also isolated that might be valuable for industrial applications.


Rhizobacteria, Endophytic Bacteria, Plant Growth Promotion, IAA Quantitative, Biofertilizer, Vegetable, Thailand

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© The Author(s) 2022. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License which permits unrestricted use, sharing, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.